[clang] [analyzer][docs] CSA release notes for clang-22 (PR #174450)

[Balázs Benics via cfe-commits]

steakhal wrote:

<img width="1021" height="1317" alt="image" src="https://github.com/user-attachments/assets/f9c8fa34-ffba-49b1-becf-9b0e421ac070" />

https://github.com/llvm/llvm-project/pull/174450